Method and device for determining the lower limit value of effective reservoir physical properties in tight oil reservoirs
A technology for the lower limit value of physical properties and the physical properties of reservoirs, which is applied in the field of geological exploration and can solve problems such as low exploration efficiency
Active Publication Date: 2019-04-23
CHINA UNIV OF PETROLEUM (BEIJING)
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However, the above method can only qualitatively determine the lower limit of the physical properties of the entire work area based on the empirical values of core or well logging data. Therefore, when the lower limit of physical properties obtained by the above method is used for oil exploration, the exploration efficiency is low
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[0029] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0030] Considering the defect that the lower limit of the physical properties of the entire work area can only be determined qualitatively based on the empirical values of core or logging data in the prior art, the inventor proposes to use the force balance relationship in the formation, that is, the formation The balance relationship b...
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The invention provides a determination method and device for an effective reservoir physical property lower limit value of tight oil reservoir. Specifically, the method includes: according to a rate of hydrocarbon expulsion from source rocks, hydrocarbon source rock thickness and organic matter abundance at a position of to-be-determined depth in a to-be-determined work area, determining unit area hydrocarbon-expulsion intensity; acquiring the viscosity and density of crude oil; according to hydrocarbon source rock thickness distribution, determining the distance from a hydrocarbon expulsion center to an edge; according to the unit area hydrocarbon-expulsion intensity, the crude oil viscosity, the crude oil density and the distance from the hydrocarbon expulsion center to the edge, calculating a critical pore throat radius at the to-be-determined depth in the to-be-determined work area; and according to the critical pore throat radius, determining the physical property lower limit value at the to-be-determined depth. An embodiment of the invention puts forward a calculation mode for quantitative determination of the critical pore throat radius, thereby measuring the physical property lower limit value at the to-be-determined depth. By utilizing the obtained more accurate physical property lower limit value to guide petroleum exploration, the exploration result can be more accurate.
Description
technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and a device for determining the lower limit value of effective reservoir physical properties of tight oil reservoirs. Background technique [0002] The lower limit of physical properties of effective reservoirs in tight oil reservoirs is mainly controlled by various factors such as reservoir fractures, lithology, pore structure type, and pore throat homogeneity. At the same time, with the development of oil and gas fields, various parameters of the reservoir, such as pressure, oil and gas saturation, and wettability, will change, resulting in changes in the lower limit of the physical properties of the reservoir. [0003] At present, the lower limit of effective reservoir physical properties in the reservoir to be tested can be calculated by means of oil testing method, distribution function curve method, irreducible water saturation method and empirical ...
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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 庞雄奇郑定业周立明郑天昱张可
Owner CHINA UNIV OF PETROLEUM (BEIJING)